Contributors: D. J. Caffrey, E. H. Siegler, Erastus Newton Bates, Frank Hurlbut Chittenden, Freeman Earl Parsons, H. P. Gould, Howard Ross Tolley, Jacob Allen Clark, Le Roy August Reynoldson, Martin Reese Cooper, Robert Henry Black, Roy Elliott Campbell, Russell Arthur Oakley, Thomas Arrington Huntington Miller, United States. Bureau of Plant Industry, William Allen Orton, William Jasper Spillman, Charles Roy Haller, Fred Campbell Meier, Harvey Leroy Westover,
2 ebooks
Publisher: U.S. Department of Agriculture
Published: 1922
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